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The proper term for the real error is doubled die. The term used for imitations and fakes is double die.

Doubled Die is indeed the correct term. I have never heard 'Double Die' used to annotate fakes and imitations. AFAIK, it is just incorrect terminology with no other connotations. I am not even sure what a fake Doubled Die would be called other than a fake. Mechanical Doubling is the closest other thing I can think of and it is just referred to as that or Machine Damage Doubling (MDD). In addition, and just picking a nit, Doubled Dies are actually considered varieties, and not errors, as they occur on every coin struck with a Doubled Die. --Qwertypoiuy 03:01, 1 November 2005 (UTC)

These coins are said to be very rare as they were made over a one night period in 1955 and only 24,000 were minted.

I was just wondering how much one is worth, they are all circulated, I know someone who found one in good condition at a Circle K in Sahuarita, Arizona. Far from New England where they were minted and usually found. --70.176.164.179 (talk) 21:43, 17 December 2009 (UTC)

This article contends that doubled dies are not errors, but instead die varieties. This is inaccurate, as per Alan Herbert in his Official Guide to Mint Errors, in which Herbert categorizes doubled dies under the "die errors" section in the PDS error system (PDS = Planchet, Die, Strike). It is well established that this is an error, and definitely was not how it was intended to be produced. Therefore, the refutation of the 1955 doubled die as not being an "error" is technically a false argument and does not belong here. Wcarper (talk) 17:58, 3 November 2010 (UTC)

This article claims "It is estimated that 24,000 of these coins were struck, all during one night shift at the Philadelphia Mint." The source[1] used for this number says 40,000 were *produced* at the mint while *24,000* made it into circulation. Replaceinkcartridges (talk) 17:13, 11 March 2015 (UTC)